Vacuum cooler



March 31, 1931.l P. SCHLUMBOHM VACUUM COOLER Filed Oct.

CF S Patented Mar. l31, 1973.1

UNITED STATES PETER scnrmonnglorrnann, GERMANY vacuum cooLnn Application led October 22, 1928, Serial No. 314,202, andin Germany October 28, 1927.

This invention is directed-to an improve' ment in vacuum coolers whereby the mate rial to be cooled is subjected to a heat exchange with Va cooling medium subject tol forced evaporation.

Various cooling means for the purpose have been heretofore proposed, such as subjecting the container with the material to be cooled to the action ofa refrigerating agent in an encircling vessel, and by a direct evaporation method through the absorption of steam by sulphuric acid. Both of these methods are rather costly in operation, and it is the object of the present invention to produce a System operating on the direct evaporation principle which is both simple of installation and inexpensive to install and maintain.

The invention is illustrated in the accompanying drawings, in which;

Figure 1 is a vertical sectional view of the improved refrigerating plant.

Figure 2 is a similar view illustrating the use of a plurality of material containing vessels.

The improved refrigerating apparatus includes a container 1. A receptacle 2 for the material to be cooled lis of a diameter to it within and in spaced relation to the wall of the container, the upper end of the receptacle being outwardly flared in semicircular form to present an edge to bear upon w a sealing gasket 3 resting upon the lateral flange at the upper end of the container, so

that the receptacle 2 forms in effect a cover for the container. Heat exchange between the cooling medium in the container and the material in the receptacle is increased by .ribs 4 radiating from the receptacle.l

An air inlet pipe 6 leads into the container near its upper end and a diametrically opposite outlet pipe 5 leads to a pump or other suction apparatus. The passage through the pipe 6 is cut oli' by a control 7 and a manometer- 8 is arranged to indicate the control of the lincoming air. The pipe 6 may beof the usual'double character to provide for cooling- 4 the incoming air, if desired.

The material to be cooled is placed in the receptacle 2 and a quantity of water placed container to materially assist in the evaporation of the cooling agent. 0n the cessation of the air suction, the vacuum is relieved and the receptacle 2 may be simply lifted from the container.

In the production of ice cream and the like, c5

-a stirrer of any conventional type may be mounted within the receptacle and operated by a turbine wheel 11, with the motive fluid, as water, entering at 1 3 and exhaustin at 14. A heat insulating cover section 15 may e used to overlie the receptacle, the edges of this cover section being down-turned to rest upon the sealing strip 3. A supporting flange connected to the container 1 by an edge chp 12 may be used to support the turbine wheel if 7 5 the latter is used.

In Figure 2, the container 1 is shown as adapted for a plurality of receptacles 2'* and 2b formed similar'to the receptacle 2 in the single form and cooperating with sealing gaskets 3, as in the form shown in Figure 1. In this form, each receptacle 2at and 2b is surrounded by a hollow wall container, as 9 and 9', Within vwhich and surrounding the receptacle the cooling medium is open to the evaporative influence of the air admitted through the pipe section 6 and withdrawn through the suctlon pipe 5. Here the hollow wall container acts in a measure as an insulating medium and the use-of such ellminates the neceswill occupy the lowerfportion of the container,

as for examplegas rings indicated at 10.

I claim 1. An evaporator for refrigerating machines comprising in combination a heat-insulating container for the cooling means open at .the top, a packing sheet with opening resting on the rim of said cooling-means container, a metal lid on said cooling-means container also open at the top serving simultaneously as vessel for the reception of the goods to be congealed, said lid dipping into the cooling-means, cooling ribs on the exterior surface of that part of said lid which dips into the cooling means, a pipe conduit mergin intothe cooling-means container and lea ing to a pump, a further pipe conduit also merging into the cooling-means container, a manometer in connection with said latter pipe conduit regulating the entrance of air into the cooling-means container, a cock in said latter pipe conduit, a system of Ldouble pipes in said latter pipe conduit for the admission of air into the cooling-means container for preliminarily cooling said air, a cover of heat-insulating material over the open upper-surface of the lid containing the material to be frozen, whereby the cooling-means container stands under partial vacuum so that the atmospheric outer air presses said lid andV cover airtightl onto the packing sheet.

2. n evaporator for refrigerating machines comprising in combination a heat-insulating container for the cooling-means open at the top, a packing sheet with openings resting on the rim of said cooling-means container, metal lids on said cooling-means container also open at the top serving simultaneously as vessels for the reception of the goods to be congealed, said lids dipping into the coolin -means, cooling ribs on the exterior sur ace of those parts of said lids which dip into the cooling means, a pipe con- -duit merging into the cooling-means container and leading to a pump, a further pipe conduit also merging into the cooling-means container, a manometer in connection with said latter `pipeeonduit regulating the entrance of air into the cooling-means container, a cock in said latter pipe conduit, a system of double pipes in said latter pipe conduit for the admission of air into the cooling-means container for preliminarilyicooling said air, covers of heat-insulating material over the open upper surfaces of the lids containing the material to be frozen, whereby the cooling-means container stands under partial vacuum so that the atmospheric outer air presses said lids and covers air-tightly onto the packing sheet.

3. An evaporator for refrigerating machines comprising in combination a heat-insulating container, intermediate vessels in said container for the reception of 'the cooling-means, the container and the vessels being open at the top, a packing sheet with openings resting on the rim of said container, metal lids on said container also open at the top serving simultaneousl)T as vessels for the reception of the goods to be congealed, said lids dipping into the cooling means contained in the intermediate vessels, cooling ribs on the exterior surfaces of those parts of said lids which dip into the cooling means, a pipe conduit merging into the evaporator and leading to a pump, a further pipe conduit also merging into the evaporation chamber, a manometer in connection with said latter pipe conduit regulating the entrance of the dosed air into the evaporation space or container, a `cock in said latter pipe conduit, a system of double pipes in said latter pipe conduit for the admission of air into the evaporation space or container for preliminarily cooling said air, covers of lieat-insulating material over the open upper surfaces of the lids containing the material to be frozen, whereby the cooling-means containers or intermediate vessels in the evaporator stand under partial vacuum so that the atmospheric outer air presses said lids and covers air-tightly onto the packing sheet.

4. An evaporator for refrigerating machines comprising in combination a heat-insulating container for the coolin means open at the top, a packing sheet with opening resting on the rim of said cooling-means container, a metal lid on said cooling-means container also open at the top serving simultaneously as vessel for the reception of the goods to be congealed, said lid dipping into the cooling-means, cooling ribs on the exterior surface of that part of said lid which dips into the cooling means, a stirrer with inand outiiow of water for the production of ice-cream, means for holding said stirrer on the rim of thecooling-means container, a cover of heat-insulating material over the open upper surface of the lid, an aperture in said cover through whichpasses the stirrer into the material to be stirred and frozen, a pipe conduit merging into the cooling-means container-and leading to a pump, a further pipe conduit also merging into the coolingmeans container, a manometer in connection with said latter pipe conduit regulating vthe entrance of air into the cooling-means container, a cock in said latter pipe conduit, a system of double pipes in said latter pipe conduit for the admission of air into the cooling-means container for preliminarily cooling said air,`whereby the cooling-means container stands under partial vacuum so that the atmospheric outer air presses said lid and cover air-tightly onto the packing sheet.

'5. An evaporator for refrigerating machines comprising in combination a heat-insulating container for the cooling means open at the to a packing sheet with opening restto be congealed, said lid dipping into the cooling-means, cooling ribs on the exterior surface of that part of said lid which dips into the cooling means, masses of slight specific Weight and suitable form laid into the cooling means for raising the level of the dosed quantity of cooling-means, a pipe conduit merging into the cooling-means container and leading to a pump, a further pipe conduit also merging into the cooling-means container, a manometer in connection with said latter pipe conduit regulating the entrance of air into the cooling-means container, a cock in said latter pipe conduit, a system of double pipes in said latter pipe conduit for the admission of air into the cooling-means container for preliminarily cooling said air, a cover of heatinsulating material over the open upper surface of the lid containing the material to be frozen, whereby the cooling-means container stands under partial vacuum so that the atlnospheric outer air presses said lid and' cover A air-tightly. onto the packing sheet.

In-testimony whereof I aiiix my signature.

PETER SCHLUMBOI-IM. 

